I found that I was having problems making software on Leopard, which I could build fine on my linux (fedora) machines. The error I was getting was:

ld: duplicate symbol _g_bit_nth_lsf in foo.o and bar.o

I am running Leopard 10.5.3. I was using glib2, installed via Fink, version number: 2.12.0-103. After spending lots of time googling I found the following article to be of the most use, “Wireshark with Macports”, where Anders Brownworth pointed out that the error was due to a “extern inline bug in glib/gutils.h which is easily fixed“.

So to fix this:

• I located gutils.h, which I found here:
  
  /sw/include/glib-2.0/glib/gutils.h
• I then replaced these lines:
  
  #ifdef G_IMPLEMENT_INLINES
  
  # define G_INLINE_FUNC
  
  # undef G_CAN_INLINE
  

  #elif defined (__GNUC__)

# define G_INLINE_FUNC extern inline

#elif defined (G_CAN_INLINE)

• With this:
  
  #ifdef G_IMPLEMENT_INLINES
  
  # define G_INLINE_FUNC
  
  # undef G_CAN_INLINE
  
  #elif defined (__APPLE__)

# define G_INLINE_FUNC static inline
  

  #elif defined (__GNUC__)

# define G_INLINE_FUNC extern inline

#elif defined (G_CAN_INLINE)

• By adding these two middle lines:
  
  #elif defined (__APPLE__)

# define G_INLINE_FUNC static inline
• The start of the fragment of code was at line number 96 in my gutils.h file

Here is a link to my edited and working gutils.h file.

Note 1: I would make sure I get a copy of my original gutils.h file, as this may come in handy

Note 2: There is a patch which one could apply to make the same changes which I have just described here. This patch follows this ticket. I didn’t know what to do with the patch file, so I ended up editing the file by hand:). I am guessing that is something todo with macports, mmm, nevermind, its working now.